chuck hagel, his pick for the pentagon -- >> mr. president i'm grateful for this opportunity to serve our country again, and especially its men and women in uniform and their families. gwen: jack lew, the choice for treasury -- >> as a kid growing up in queens, i had dreams of making a difference in the world. gwen: john brennan at the c.i.a., and john kerry at state. key advisers whose actions could define the obama legacy. plus, tackling two prickly issues -- u.s. involvement in plus, tackling two prickly issues -- u.s. involvement in afghanistan --